YouTrackForReSharper is a project mainly written in ..., it's free.
Plug-in for ReSharper to talk to YouTrack
YouTrackSharp
.NET Library to access YouTrack API.
For more information on YouTrack visit:
http://www.jetbrains.com/youtrack
Please log all issues are tracked here: http://youtrack.codebetter.com/issues/YTSRP